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Which is the basic unit in a skeletal muscle?

Why did the authors choose to look for the rubisco gene in the DNA samples taken from permafrost?

The basic job of skeletal muscle is to pump blood through the body.

Fossil evidence places the origin of angiosperms in the Jurassic period, at least 144 million years ago. The major lineages of angiosperms today were in place approximately 100 million years ago. Now, angiosperms make up 95% of all modern plant species. What relationship between angiosperms and animals may have aided the rapid diversification of flowering plants?

The pores through which leaves exchange atmospheric gases with leaf cells during photosynthesis are the

Why did the authors choose to look specifically for vertebrate mitochondrial genes in their core samples?

A type of gland that secretes an oily substance that softens and protects hair is a(n) ________ gland.

Even semi-aquatic reptiles like crocodiles and alligators can spend much of their life on dry land. Which of the following is an example of an adaptation that would allow reptiles to live and reproduce on dry land?

What is the function of the simple squamous cells found in the glomeruli of the kidney?

Clostridium tetani, the bacterium that causes tetanus, can survive in soil for up to 40 years. Forming which of the following structures would support its longevity?